题目

 When you watch TV programs about wild animals, it is surprising to see how an antelope can escape a lion’s attack. In the wilderness, everyone has a stunt(绝招). Even plants have their own ways of fighting off enemies. Over millions of years of evolution(进化), plants have developed a unique defence system. Chemicals are widely used for survival. By making their leaves, flowers, roots and fruits poisonous to enemies, plants can fight back. One such plant is the Golden Wattle tree, British scientist David Caneron has found when an animal eats the tree’s leaves, the amount of po气象站想统计某月的天气变化情况，应选择（ ）A. 条形统计图B. 扇形统计图C. 折线统计图